The art for the sandcastles don't look too impressive, but that's alright. Pokemon designs aren't something only to be judged by their official art anymore. 3D models have given them more personality than dex entries ever could.

It's made of sand. Imagine how it's going to move. It's going to be undulating, rippling. Remember Muk and Grimer's animations in Stadium? It's going to be cool as fuck.